maps/index.html at main · eja/maps · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link href="/static/css/maplibre-gl.css" rel="stylesheet">
  <style>
    body { margin: 0; padding: 0; }
    #map { position: absolute; top: 0; bottom: 0; width: 100%; }
  </style>
</head>

<body>

<div id="map"></div>

<script src="/static/js/pmtiles.js"></script>
<script src="/static/js/maplibre-gl.js"></script>
<script src="/static/js/basemaps.js"></script>

<script>
const protocol = new pmtiles.Protocol();
maplibregl.addProtocol("pmtiles", protocol.tile);

let fileUrl = "{{.File}}";
if (fileUrl.substring(0, 1) == "{") { fileUrl = window.location.search.slice(1); }

if (!fileUrl) {
  alert("Add ?map.pmtiles or ?map.mbtiles to URL");
  throw new Error("Missing file parameter");
}

async function initMap() {
  let mapSource = {};
  let detectedSchema = "protomaps";

  if (fileUrl.includes(".pmtiles")) {
    mapSource = {
      type: "vector",
      url: "pmtiles://" + fileUrl,
      attribution: "PMTiles"
    };
    try {
      const p = new pmtiles.PMTiles(fileUrl);
      const metadata = await p.getMetadata();
      if (metadata && metadata.description && metadata.description.toLowerCase().includes("openmaptiles")) {
        detectedSchema = "openmaptiles";
      }
    } catch (e) {
      console.warn("Could not read metadata, defaulting to protomaps", e);
    }
  } else if (fileUrl.includes(".mbtiles")) {
    const mbtilesPath = fileUrl;

    try {
      const metadataUrl = mbtilesPath + "/metadata.json";
      const response = await fetch(metadataUrl);
      const metadata = await response.json();

      if (metadata.description && metadata.description.toLowerCase().includes("openmaptiles")) {
        detectedSchema = "openmaptiles";
      }

      mapSource = {
        type: "vector",
        tiles: [window.location.origin + mbtilesPath + "/{z}/{x}/{y}"],
        minzoom: metadata.minzoom || 0,
        maxzoom: metadata.maxzoom || 14,
        attribution: metadata.attribution || "MBTiles"
      };

      if (metadata.bounds) {
        if (typeof metadata.bounds === 'string') {
          const bounds = metadata.bounds.split(',').map(parseFloat);
          if (bounds.length === 4) {
            mapSource.bounds = bounds;
          }
        } else if (Array.isArray(metadata.bounds)) {
          mapSource.bounds = metadata.bounds;
        }
      }
    } catch (e) {
      console.warn("Could not read MBTiles metadata, using defaults", e);
      mapSource = {
        type: "vector",
        tiles: [window.location.origin + mbtilesPath + "/{z}/{x}/{y}"],
        minzoom: 0,
        maxzoom: 14,
        attribution: "MBTiles"
      };
    }
  } else {
    mapSource = {
      type: "vector",
      tiles: [window.location.origin + fileUrl + "/{z}/{x}/{y}"],
      minzoom: 0,
      maxzoom: 14
    };
  }

  let mapStyle = { version: 8, sources: {}, layers: [] };

  if (detectedSchema === "protomaps") {
    mapStyle.sources["protomaps"] = mapSource;
    mapStyle.sprite = window.location.origin + "/static/pics/light";
    mapStyle.layers = basemaps.layers("protomaps", basemaps.namedFlavor("light"), { lang: "en" });
  } else if (detectedSchema === "openmaptiles") {
    try {
      const response = await fetch("/static/pics/openmaptiles.json");
      const externalStyle = await response.json();
      externalStyle.sources['openmaptiles'] = mapSource;
      externalStyle.sprite = window.location.origin + "/static/pics/openmaptiles-bright";
      mapStyle = externalStyle;
    } catch (err) {
      console.error("Failed to load external JSON style, falling back to protomaps", err);
      mapStyle.sources["protomaps"] = mapSource;
      mapStyle.sprite = window.location.origin + "/static/pics/light";
      mapStyle.layers = basemaps.layers("protomaps", basemaps.namedFlavor("light"), { lang: "en" });
    }
  }

  const map = new maplibregl.Map({
    container: "map",
    style: mapStyle,
  });

  map.addControl(new maplibregl.GeolocateControl({
    positionOptions: { enableHighAccuracy: true },
    trackUserLocation: true,
    showUserHeading: true
  }));
  map.addControl(new maplibregl.NavigationControl());

  let longPressTimer;
  const showPopup = (e) => {
    const lat = e.lngLat.lat.toFixed(5);
    const lng = e.lngLat.lng.toFixed(5);

    const features = map.queryRenderedFeatures(e.point);

    let finalValue = null;
    let finalLabel = "Elevation";

    const usefulFeature = features.find(f => {
      const p = f.properties;
      return (p.height != null || p.elevation != null || p.ele != null);
    });

    if (usefulFeature) {
      if (usefulFeature.properties.height) {
        finalValue = usefulFeature.properties.height;
        finalLabel = "Height";
      } else if (usefulFeature.properties.ele) {
        finalValue = usefulFeature.properties.ele;
      } else if (usefulFeature.properties.elevation) {
        finalValue = usefulFeature.properties.elevation;
      }
    }

    let htmlContent = `<strong>Latitude:</strong> ${lat}<br><strong>Longitude:</strong> ${lng}`;

    if (finalValue !== null) {
      htmlContent += `<br><strong>${finalLabel}:</strong> ${finalValue}m`;
    }

    if (features.length > 0) {
      htmlContent += `<hr>`;
      const processed = new Set();
      features.forEach((feature) => {
        const layer = feature.sourceLayer || "N/A";
        const kind = feature.properties.class || feature.properties.kind || feature.properties.type || "";

        if (processed.has(layer)) return;
        processed.add(layer);

        htmlContent += `
          <div class="feature-item">
          <span style="color:#666;">Layer:</span> <b>${layer}</b><br>
          <span style="color:#666;">Kind:</span> ${kind}
          </div>`;
      });
    } else {
      htmlContent += `<br><em>No vector features.</em>`;
    }

    new maplibregl.Popup({ closeOnClick: false, maxWidth: '300px' })
      .setLngLat(e.lngLat)
      .setHTML(htmlContent)
      .addTo(map);
  };

  const startTimer = (e) => {
    clearTimeout(longPressTimer);
    longPressTimer = setTimeout(() => { showPopup(e); }, 500);
  };
  const cancelTimer = () => clearTimeout(longPressTimer);

  map.on('mousedown', startTimer);
  map.on('touchstart', startTimer);
  map.on('mouseup', cancelTimer);
  map.on('touchend', cancelTimer);
  map.on('dragstart', cancelTimer);
}

initMap();
</script>
</body>
</html>